TL2843B TL284xB, TL384xB | 德州仪器 TI.com.cn

TL2843B
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TL284xB, TL384xB

TL284xB, TL384xB - TL2843B
数据表
 

描述

The TL284xB and TL384xB series of control integrated circuits provide the features that are necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of external components. Internally implemented circuits include an undervoltage lockout (UVLO) and a precision reference that is trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The TL284xB and TL384xB series are pin compatible with the standard TL284x and TL384x with the following improvements. The start-up current is specified to be 0.5 mA (max), while the oscillator discharge current is trimmed to 8.3 mA (typ). In addition, during undervoltage lockout conditions, the output has a maximum saturation voltage of 1.2 V while sinking 10 mA (VCC = 5 V).

Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842B and TLx844B devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843B and TLx845B devices are 8.4 V (on) and 7.6 V (off). The TLx842B and TLx843B devices can operate to duty cycles approaching 100%. A duty-cycle range of 0% to 50% is obtained by the TLx844B and TLx845B by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle.The TL284xB-series devices are characterized for operation from -40°C to 85°C. The TL384xB-series devices are characterized for operation from 0°C to 70°C.

特性

  • Low Start-Up Current (<0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Current Mode Operation to 500 kHz
  • Automatic Feed-Forward Compensation
  • Latching PWM for Cycle-by-Cycle Current Limiting
  • Internally Trimmed Reference With Undervoltage Lockout
  • High-Current Totem-Pole Output Undervoltage Lockout With Hysteresis
  • Double-Pulse Suppression

WEBENCH® Designer TL2843B

 AC  DC  
AC 频率  60 Hz  50 Hz
Use Isolated Output?
  最小   最大 范围
VinRMS  V 10.00 ç»™拟 2000.00V
输出电压  V 3.3 ç»™拟 1000V
输出电流  A ≤ 100A
环境温度  °C -40 ç»™拟 85°C

参数

与其它产品相比 PWM控制器和谐振控制器 邮件 下载到电子表格中
Part number 立即下单 Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
TL2843B 立即下单 Boost
Flyback
Forward    
Current     8.4     30     500     8.4/7.6     100     0.2     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology    
Catalog     -40 to 85     PDIP | 8
SOIC | 14
SOIC | 8    
8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)    
TL2842B 立即下单 Boost
Flyback
Forward    
Current     16     30     500     16/10     100     0.2     Adjustable Switching Frequency
Error Amplifier
Multi-topology    
Catalog     -40 to 85     PDIP | 8
SOIC | 14
SOIC | 8    
8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)    
TL2844B 立即下单 Boost
Flyback
Forward    
Current     16     30     500     16/10     50     0.2     Adjustable Switching Frequency
Error Amplifier
Multi-topology    
Catalog     -40 to 85     SOIC | 14
SOIC | 8    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)    
TL2845B 立即下单 Boost
Flyback
Forward    
Current     8.4     30     500     8.4/7.6     50     0.2     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology    
Catalog     -40 to 85     SOIC | 14
SOIC | 8    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)